Fluid-pressure-brake system



June 24, 1930. H. J. WINTER FLUID PRESSURE BRAKE SYSTEM Filedl Nov. 5. 19.28

HQRRY d. WINTER Y. E N R O T T.. A

INVENTOR Patented June 24, 1930 UNITED STATES PATENT omer.

meer J, WINTER, 'or Lerner, MQAND, ASSIGNQR TQ me WEssiNssQUSE MR Animation 11i-ed November aisee, vhscrinium. 317,159; and in omar Britain February z, 192e.

This invention rel'ates t9 EHuid pressure brakes, and more particularly .to fa bra-ke equipment provided with Vempty and load brake cylinders for the purpose oi varying the 'braking effort' in accordance with 'the load 'on the car. y c

Que object of in' invention is to provide an empty and load grakeequipment in which upon applying the brakes, thefeiective stroke ofthe empty 'brakeV cylinder .piston is rapidly effected and substantially completed before fluid `under pressure is supplied to the load brake cylinder, While upon release'-l in'g 'the brakes, `fluid under pressure lis first released f'roin the load brake cylinder. 1

Another object of the invention is to provide a generally improved and simplified empty and'lo'ad brake ecluip'rnent.y v

In the accompanying draWingJhe single figure 'is a diagrammatic View, 'partly in secutioii, of 'an lei'pty and load brake equipment embodying invention.

Theequr'ipment shown is of the combined automati'can'd straight air type, though 'the invention be employed, it desired, either with 'an automatic or a straight air ylcralre system. y y Y, As shown in' 'the drawingtlre equipment may comprise an automatic brake system including' the usual brake pipe 1, tripl'ei y valve/'device 2,1auXli-liary reservoir 3, and

a straight air brake pipe Y A'controlli'ng Valve 'device is provi-ded comprising a lcasing 5 having ,a vertical cylinder 'containing a piston valve 6.

. The Pisten 'valve s lermely 'held t0 its lower seat by al coilsprng 7 and the chainber 8 apoye the ,piston value is openl tothe mep-hee ihm-'gh por# e, A. road, brak@ cylinder' 150 is! 'Connected .th'eu'sh Pire l1 and passage l12 with 'chamber `8 "and :passage 12 is courreated te chamber below ythe piston vaive tl'irough 4a restrictedport 14.*

y Anern'pty brake/cylinder isc'onnected to a pipe '1'6 which leads y"to passage in the 3a-'snag 5 when the verve piston "6 is seated yiriVits llouter psiti'ir, 'said passage is connected 'through a groove 18 1in' the pistol-1 with fa lpassage119,"W-hich leads 'to a chamber 20'jat the inner seated area oi the valve piston. Y Y

A double 'check valve '2l is 'disposed in a horizontal cylinder provided in the casing 5. Ports 22 lead from the cylinder containing the check valve 21`t0 chamber20.

The 'chamberatoae Side of the' dou-b1@ check Valye 21 is open to pipe 28, through' Whiclrtheftriple "valve device 2 operatesto supply Huid 'under pressure to the brake cylinder in applying the brakes 'and the straight air pipe 4 leads to the chamber at the opposite sident 'the double checiyalve.

In' operation,- 'if an automatic application' of the brakes is effected by reduction in' brake' pipe pressure, fluid under-pressureis supplied from the auxiliary reservoir '3 by operation of the triple valve device 2 to pipe 23 and enters the check yal've'cliamber, causing the double check valve 2l to be shifted to its right hand seat, thus cutting off communication from the 'straight a'i'r pipe 4. Y i

Fluid under pressure then flows through the ports 22 to chamber 2O and passage i9 and thence through grooye 18 and passage 17 'to pipe 16' and the empty brake cylin- Fluid under pressure is thus rapidlyl sup'- plied to the empty brake cylinder-,the piston of which then moves out to take up the slack in the brake rigging ano exert a corresponding braking efforton the Wheels of the Vehicle As --soon as the pressure in the empty brake cylinder and( in chamber 20 reaches a predetermined value, 'the' piston valye 6 is moved upwardly against the pressure ci the spring 7. When the piston Valve 6 moves from its lcv-nerA seat, theye'ntir'e area;

i3 through the restricted port lli top'assage ce pressure and the piston consequent-ly' moves 12 whence fluid under pressure flows through pipe ll to the load brake cylinder, at a relatively low rate.

The flow of fluid underV pressure to the empty brake cylinder l5 continues through the restricted port 24, so as to permit the empty brake cylinder pressure to buildup gradually to the final brake cylinder pres- SuIe.

It will thus be seen that lfluid under-*pressure is initially and rapidly supplied to the empty brake cylinder and then, when a predetermined pressure is obtained in the empty brake cylinder, corresponding with the pressure of the spring 7, fluid under pressure is relatively slowly supplied to the load brake cylinder, wliile the further supply of fluid under pressure to the empty 'brake cylinder continues at a relatively slow rate.

It will be understood that the load port 14 is so proportioned as to enable the vpressure to build up on the load brake cylinder at the desired rate, while the empty port 9A is so proportioned as to ensure the desired final rate of build up in empty brake cylinder pressure. Y v Y When the brakeipipe pressure is increased to effect the release of the brakes, the triple valve device 2 operates to connect pipe with the atmosphere, and fluid is vented from the empty brake cylinderrl through the port 24 and from the load brake cylinder l through the port lll.

As soon as a predetermined reduction in pressure inthe load brake cylinder has been effected, the piston valve returns to its lower seat,thereby permitting fluid-to be vented from the load brake cylinder 10 direct to the atmosphere by way of the -port Y 9. At the same time, free communication from the empty brake cylinder i5 tothe triple valve device is established through thel groove 18 in the piston Valve and the final exhaust from the empty brake cylinder takes place through the groove I8, the rate of flow, however,1being less than the rateof release of ,fluid from the load bral-Ie cylinder, through the port 9.

Vhen a straightair application vof the brakesv is effected, the pressure of fluid supplied to the straight air pipe 4; operates to shift the double check valver2l toV its eX- treme left hand position, the flow of Huid Vfrom the checkvalve cylinder to the empty and load brake cylinders and the release of l fluid therefrom, taking place through the samek ports and passages and in the same manner as hereinbefore Vdescribed in connection withV an automatic application and release of the brakes. l Y n The pipe ll,V leading to the `load brake cylinder l0 is provided with a cut-out cock 25, so that when the vehicle is empty or lightly loaded, the cock may be turned to a position in which communication `from the load brake cylinder to the controlling valve device is cut olf.

' In this position, a port 26 preferably connects the load brake cylinder with an atmospheric exhaust portv 27, so that the load brake cylinder will be maintained at atmospheric pressure. i

Whileone illustrative embodiment of the invention has been described in detail, it is not my intention' to limitrits scope tothatA under pressure to the empty brake cylinder,

and means operated upon a predetermined increase in pressure in theempty brake cyl-v inder,` for supplying fluid under..` pressure to the load *brake* cylinder ,and for limiting the rate of ilow to the empty brake cylinder. 2. In an empty and load brake apparatus, the combination with an empty and a load brake cylinder, of/means for supplying fluid' under pressure to the empty brake cylinder, and means operated upon a predetermined increase in pressure in the empty brake cylinder for supplying fluid under pressure to the load brake cylinderat a predetermined slow rate and to the empty brake cylinder at a predetermined slow rate. i

3. In an empty and load brake apparatus, the combination with an empty and a load brake cylinder, of means for supplying iluid under pressureto the empty bralecylinder, and means for first supplying fluid `under pressure to the empty brake cylinder only Cil at a rapid rate and then to both Ybrake ,cyl-

inders at a relatively slow rate.

fl. In an empty and'load brake apparatus', the combination withV an empty and a load brake cylinder, of' means for supplying fluid under pressure to the empty brakeucylin dei', and means for first supplyingfluidrun-V der pressure toV the empty brake cylinder only at a rapid rate and then, upon apredetermined increase in pressurein the empty brake cylinder, to both the empty Yandthe load brake cylindersr at, a relatively yslow rate. 'i f f 5. In an empty and load brake apparatus, the combination with anv A'empty and a load brake cylinder, of means yfor supplying fluid under Vpressure to the empty brake cylinder,

and a piston valve controlling 'communicaf opening a restricted communication, through which Vfluid under pressure is supplied to the load brake cylinder.

7. In an empty and load brake apparatus, the combination With an empty and a load brake cylinder, of means for supplying iiuid under pressure to the empty brake cylinder, a spring, and a piston valvesubject to the opposing pressures of the empty brake .cylinder and said spring and operating upon a predetermined increase in pressure in the empty brake cylinder for opening a restricted communication, through Which fluid under pressure is supplied to the load brake cylinder.

8. In an empty and load brake apparatus, c

the combination With an empty and a load brake cylinder, of means for supplying fluid under pressure to the'empty brake cylinder, and valve means operated upon a predetermined increase in pressure in the empty brake cylinder for opening a communication through which fluid under pressure is supplied to the load brake cylinder and upon a predetermined decreased in pressure in the load brake cylinder for opening a communication from the load brake cylinder direct to the atmosphere.

9. In an empty and load brake apparatus, the combination With an empty and a load brake cylinder, of means for supplying fluid under pressure to the empty brake cylinder, and valve means operated upon a predetermined increase in pressure in the empty brake cylinder for opening a communication through which fluid under pressure is supplied to the load brake cylinder andfor restricting the rateof ow'of fluid to the empty brake cylinder and operating upon a predetermined decrease in vpressure in the load brake cylinder for opening a direct ex'- y haust port to the load brake cylinder.

l0. In an empty and load brakea'pparatus, the combination with an empty anda load brake cylinder, of means for supplying fluid under pressure 'to the empty brake cylinder, valve means operated upon a predetermined increase inV pressure in the empty brake cylinder for opening a com,

munication through which fluid underpressure is supplied to the load brake cylinder, and valve means operatedupona predeterminedv increase in pressure in the empty brake cylinder foropening communication through a restricted port, through `Which fluid under pressure is supplied to the load brake cylinderand for limiting the flow to the empty brake cylinder by flow through a restricted port, the initial release of fluid from the brake cylinders being by Way of said restricted ports, and said Valve means being operated upon a predetermined decrease in pressure in the load brake cylinder, for opening a direct atmospheric eX-.

haust port to the load brake cylinder.l

In testimony whereof I have hereunto set my hand, this 22nd day of October, 1928. HARRY J. WINTER.

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